Garmin Forerunner 305

Garmin Forerunner 305

Whether you're training for a marathon or just trying to lose those extra holiday pounds, this tiny electronic training partner will keep you up to speed on how you're doing. The Garmin Forerunner 305 ($350; available in Feb.) monitors your heart rate, speed, distance, pace and calories burned — and has an integrated high-sensitivity GPS receiver that tracks your every move.

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